Same privacy policy authorizing them to harvest your data, but older cars have a more limited capability to collect data compared to newer cars filled with sensors, cameras, and phone integrations. Plus older cellular networks are defunct for older vehicles so they can’t just exfil it without you helping or bringing it in to physically access it.
Microsoft certainly tries it’s best to keep you locked into their ecosystem by making it inconvenient but not impossible to leave though that’s not the real reason, it’s security. Businesses and especially governments are scared of nation state hackers contributing malicious code to open source products and falsely assume it’s safer to use closed source software because those incidents aren’t public. There’s so much great software out there I’d love to use and the first question I’m asked when I bring it up is can you prove China hasn’t contributed code?